Using the iXS Carve EVO+ Knee Guard is easy. First, pick the right size according to the size chart. Put the guard on your knee, make sure the silicon stopper is at the top to keep it from slipping. Adjust the Loop - Lock™ closings to get a snug fit. When you're out using the knee guards, don't worry about them hindering your movement. The X - matter™ foam will protect your knees from impacts. If you notice the padding getting worn out, you can replace it with the individual replacement insert. As for maintenance, take the guards off after use. You can gently hand - wash the Aero Mesh™ part with mild soap and water. Let them air - dry. Avoid using harsh chemicals or putting them in the dryer as this might damage the materials. Keep the guards in a cool, dry place when not in use.